feat: add useRouteQuery composable

docs/3.api/2.composables/use-route-query.md

@@ -0,0 +1,134 @@
+---
+title: "useRouteQuery"
+description: The useRouteQuery composable simplifies working with query parameters.
+links:
+  - label: Source
+    icon: i-simple-icons-github
+    to: https://github.com/nuxt/nuxt/blob/main/packages/nuxt/src/app/composables/router.ts
+    size: xs
+---
+
+::note
+You can use `useRouteQuery` to seamlessly retrieve and update query parameters directly within your application.
+::
+
+## Example
+
+In the following example, we create a dynamic search interface. The input field updates the `q` query parameter in the URL, which is then used to fetch data from the Google Books API.
+
+```vue [~/pages/index.vue]
+<script setup lang="ts">
+const query = useRouteQuery('q');
+const { data } = await useFetch('https://www.googleapis.com/books/v1/volumes', {
+  params: {
+    q: query,
+  },
+});
+</script>
+
+<template>
+  <input v-model="query" placeholder="Search for books..." />
+  <div v-for="book in data?.items" :key="book.id">
+    {{ book.volumeInfo.title }}
+  </div>
+</template>
+```
+
+## Features
+
+- **Retrieve Query Parameters**: Access specific query parameters with default values.
+- **Update Query Parameters**: Dynamically modify query parameters, reflecting changes in the URL.
+- **Automatic Cleanup**: Remove empty or default parameters with configurable options.
+
+## API
+
+### `useRouteQuery(param, defaultValue, options)`
+
+#### Parameters
+
+- `param` (String): The name of the query parameter to manage.
+- `defaultValue` (String): The default value if the query parameter is not present.
+- `options` (Object):
+  - `removeEmpty` (Boolean): Remove parameters with empty values. Default: `true`.
+  - `removeDefault` (Boolean): Remove parameters equal to the default value. Default: `true`.
+
+#### Returns
+
+A `computed` object with:
+
+- **`get`**: Retrieves the current value of the query parameter or the default value.
+- **`set`**: Updates the query parameter in the URL.
+
+## Additional Examples
+
+### Basic Retrieval
+
+Retrieve a query parameter with a default value fallback:
+
+```javascript
+const searchQuery = useRouteQuery('search', 'defaultSearch');
+console.log(searchQuery.value); // Outputs: 'defaultSearch' if `?search` is not in the URL
+```
+
+### Dynamic Updates
+
+Update the query parameter dynamically:
+
+```javascript
+const searchQuery = useRouteQuery('search', 'defaultSearch');
+searchQuery.value = 'newSearchValue';
+// URL updates to include `?search=newSearchValue`
+searchQuery.value = '';
+// URL removes `?search` due to `removeEmpty: true`
+```
+
+### Custom Options
+
+Customize behavior with options:
+
+```javascript
+const filterQuery = useRouteQuery('filter', 'all', {
+  removeEmpty: false,
+  removeDefault: false,
+});
+filterQuery.value = '';
+// URL remains `?filter=` because `removeEmpty` is `false`
+filterQuery.value = 'all';
+// URL remains `?filter=all` because `removeDefault` is `false`
+```
+
+### Toggle Query Parameter
+
+Manage a toggle state with a query parameter:
+
+```javascript
+const isVisible = useRouteQuery('visible', false);
+function toggleVisibility() {
+  isVisible.value = !isVisible.value;
+}
+// Updates the URL to `?visible=true` or removes `?visible`
+```
+
+### Managing Multiple Query Parameters
+
+Handle multiple query parameters simultaneously:
+
+```javascript
+const category = useRouteQuery('category', 'all');
+const sort = useRouteQuery('sort', 'asc');
+category.value = 'books';
+sort.value = 'desc';
+// URL updates to `?category=books&sort=desc`
+```
+
+## Notes
+
+- Ensure that `useRouteQuery` is used within a Nuxt component or setup function to access `useRoute` and `useRouter`.
+- Query updates replace the entire query object. Ensure no unintended parameters are overwritten.
+
+## Limitations
+
+- This composable does not handle deeply nested query parameters.
+- It is designed for flat query structures only.
+
+::read-more{icon="i-simple-icons-vuedotjs" to="https://vuejs.org/api/reactivity-core.html#computed"}

packages/nuxt/src/app/composables/router.ts

@@ -1,5 +1,5 @@
-import { getCurrentInstance, hasInjectionContext, inject, onScopeDispose } from 'vue'
-import type { Ref } from 'vue'
+import { computed, getCurrentInstance, hasInjectionContext, inject, onScopeDispose } from 'vue'
+import type { ComputedRef, Ref } from 'vue'
 import type { NavigationFailure, NavigationGuard, RouteLocationNormalized, RouteLocationRaw, Router, useRoute as _useRoute, useRouter as _useRouter } from 'vue-router'
 import { sanitizeStatusCode } from 'h3'
 import { hasProtocol, isScriptProtocol, joinURL, withQuery } from 'ufo'
@@ -280,3 +280,40 @@ export function encodeURL (location: string, isExternalHost = false) {
   }
   return url.toString()
 }
+
+interface UseRouteQueryOptions {
+  removeEmpty?: boolean
+  removeDefault?: boolean
+}
+
+export function useRouteQuery (
+  param: string,
+  defaultValue: string | null = null,
+  options: UseRouteQueryOptions = {
+    removeEmpty: true,
+    removeDefault: true,
+  },
+): ComputedRef<string | null> {
+  const route = useRoute()
+  const router = useRouter()
+
+  return computed<string | null>({
+    get () {
+      const value = route.query[param]
+      return (value as string | undefined) ?? defaultValue
+    },
+    set (value: string | null) {
+      const newQuery = { ...route.query, [param]: value }
+
+      if (options.removeEmpty && (value === null || value === undefined || value === '')) {
+        delete newQuery[param]
+      }
+
+      if (options.removeDefault && value === defaultValue) {
+        delete newQuery[param]
+      }
+
+      router.push({ query: newQuery })
+    },
+  })
+}